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Gestión de la energía
Controladores LED
Controladores para LED de retroiluminación

TPS61043

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TPS61043: Controlador LED de corriente constante

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TPS61043

ACTIVO
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Detalles del producto

Number of channels 1 Vin (min) (V) 1.8 Vin (max) (V) 6 Vout (min) (V) 1.8 Vout (max) (V) 16.9 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 88 LED current per channel (mA) 50 Peak efficiency (%) 85 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 1 Vin (min) (V) 1.8 Vin (max) (V) 6 Vout (min) (V) 1.8 Vout (max) (V) 16.9 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 88 LED current per channel (mA) 50 Peak efficiency (%) 85 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
VSON (DRB) 8 9 mm² 3 x 3
  • Current Source With 18-V Overvoltage Protection
  • Powers up to 4 LEDs in Series
  • Input Voltage Range: 1.8 V to 6 V
  • Internal 30-V Switch
  • Up to 85% Efficiency
  • Precise Brightness Control Using PWM Signal or
    Analog Signal
  • Switching Frequency up to 1 MHz
  • Internal Power MOSFET Switch 400 mA
  • Operates With Small Output Capacitors Down to
    100 nF
  • Disconnects LEDs During Shutdown
  • No Load Quiescent Current 38 µA Typical
  • Shutdown Current 0.1 µA Typical
  • Available in a Small 3-mm × 3-mm QFN Package
  • Current Source With 18-V Overvoltage Protection
  • Powers up to 4 LEDs in Series
  • Input Voltage Range: 1.8 V to 6 V
  • Internal 30-V Switch
  • Up to 85% Efficiency
  • Precise Brightness Control Using PWM Signal or
    Analog Signal
  • Switching Frequency up to 1 MHz
  • Internal Power MOSFET Switch 400 mA
  • Operates With Small Output Capacitors Down to
    100 nF
  • Disconnects LEDs During Shutdown
  • No Load Quiescent Current 38 µA Typical
  • Shutdown Current 0.1 µA Typical
  • Available in a Small 3-mm × 3-mm QFN Package

The TPS61043 is a high-frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252 mV (typical). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured so that the brightness is controlled by an analog signal as well, as described in Application Information. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device by limiting the output voltage to typically 18 V in case of a high-impedance output (for example, faulty LED). The TPS61043 device provides a solution for applications where higher LED currents or more than four LEDs in series must be powered.

The TPS61043 is a high-frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252 mV (typical). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured so that the brightness is controlled by an analog signal as well, as described in Application Information. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device by limiting the output voltage to typically 18 V in case of a high-impedance output (for example, faulty LED). The TPS61043 device provides a solution for applications where higher LED currents or more than four LEDs in series must be powered.
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Documentación técnica

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* Data sheet TPS61043 Constant Current LED Driver datasheet (Rev. C) PDF | HTML 02 feb 2016
White paper Common LED Functions and LED Driver Design Considerations 21 sep 2020
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 11 dic 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 jun 2018
Application note Optimizing Transient Response of Internally Compensated DC-DC Converters (Rev. B) 29 nov 2017
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) 15 jun 2017
Analog Design Journal Design considerations for a resistive feedback divider in a DC/DC converter 26 abr 2012
Analog Design Journal IQ: What it is, what it isn’t, and how to use it 17 jun 2011

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